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IOWA COUNTIES (by year established)
There are 99 administrative divisions, referred to as counties, in the state of Iowa. The population figures given below are from the 2000 census. You may list the counties by county name, by area in square miles, by year organized or by population by clicking on the column headings or using the pull-down list box.
County Area (sq miles) County Seat Established Population (2000) Search
Des Moines County 416 Burlington [ Map ] 1834 42,351 Search
Dubuque County 608 Dubuque [ Map ] 1834 89,143 Search
Henry County 434 Mount Pleasant [ Map ] 1836 20,336 Search
Lee County 517 Fort Madison [ Map ] 1836 38,052 Search
Louisa County 402 Wapello [ Map ] 1836 12,183 Search
Muscatine County 439 Muscatine [ Map ] 1836 41,722 Search
Van Buren County 485 Keosauqua [ Map ] 1836 7,809 Search
Benton County 716 Vinton [ Map ] 1837 25,308 Search
Buchanan County 571 Independence [ Map ] 1837 21,093 Search
Cedar County 580 Tipton [ Map ] 1837 18,187 Search
Clayton County 779 Elkader [ Map ] 1837 18,678 Search
Clinton County 695 Clinton [ Map ] 1837 50,149 Search
Delaware County 578 Manchester [ Map ] 1837 18,404 Search
Fayette County 731 West Union [ Map ] 1837 22,008 Search
Jackson County 636 Maquoketa [ Map ] 1837 20,296 Search
Johnson County 614 Iowa City [ Map ] 1837 111,006 Search
Jones County 575 Anamosa [ Map ] 1837 20,221 Search
Keokuk County 579 Sigourney [ Map ] 1837 11,400 Search
Linn County 718 Cedar Rapids [ Map ] 1837 191,701 Search
Scott County 458 Davenport [ Map ] 1837 158,668 Search
Washington County 569 Washington [ Map ] 1837 20,670 Search
Jefferson County 435 Fairfield [ Map ] 1839 16,181 Search
Appanoose County 496 Centerville [ Map ] 1843 13,721 Search
Black Hawk County 567 Waterloo [ Map ] 1843 128,012 Search
Davis County 503 Bloomfield [ Map ] 1843 8,541 Search
Iowa County 586 Marengo [ Map ] 1843 15,671 Search
Mahaska County 571 Oskaloosa [ Map ] 1843 22,335 Search
Monroe County 433 Albia [ Map ] 1843 8,016 Search
Poweshiek County 585 Montezuma [ Map ] 1843 18,815 Search
Tama County 721 Toledo [ Map ] 1843 18,103 Search
Wapello County 432 Ottumwa [ Map ] 1843 36,051 Search
Madison County 561 Winterset [ Map ] 1844 14,019 Search
Marion County 554 Knoxville [ Map ] 1845 32,052 Search
Boone County 572 Boone [ Map ] 1846 26,224 Search
Clarke County 431 Osceola [ Map ] 1846 9,133 Search
Dallas County 586 Adel [ Map ] 1846 40,750 Search
Decatur County 532 Leon [ Map ] 1846 8,689 Search
Jasper County 730 Newton [ Map ] 1846 37,213 Search
Lucas County 431 Chariton [ Map ] 1846 9,422 Search
Marshall County 572 Marshalltown [ Map ] 1846 39,311 Search
Polk County 570 Des Moines [ Map ] 1846 374,601 Search
Story County 573 Nevada [ Map ] 1846 79,981 Search
Warren County 572 Indianola [ Map ] 1846 40,671 Search
Wayne County 526 Corydon [ Map ] 1846 6,730 Search
Allamakee County 640 Waukon [ Map ] 1847 14,675 Search
Fremont County 511 Sidney [ Map ] 1847 8,010 Search
Page County 535 Clarinda [ Map ] 1847 16,976 Search
Taylor County 534 Bedford [ Map ] 1847 6,958 Search
Winnebago County 400 Forest City [ Map ] 1847 11,723 Search
Winneshiek County 690 Decorah [ Map ] 1847 21,310 Search
Pottawattamie County 954 Council Bluffs [ Map ] 1848 87,704 Search
Adair County 569 Greenfield [ Map ] 1851 8,243 Search
Adams County 424 Corning [ Map ] 1851 4,482 Search
Audubon County 443 Audubon [ Map ] 1851 6,830 Search
Bremer County 438 Waverly [ Map ] 1851 23,325 Search
Buena Vista County 575 Storm Lake [ Map ] 1851 20,411